Power-operated hand tool



E. H. KARLEEN 2,531,849

POWER OPERATED HAND TOOL 2 Sheets-Sheet l z I llllllhllhu I.

INVENTOR.

Edward 11. fi arfieezz ATTORNEY Patented Nov. 28, 1950 POWER-OPERATED HAND TOOL Edward H. Karleen, Denville, N. J., assignor to Processing Equipment Corporation, Bloomfield, N. J a corporationof New York Application February 12, 1949, Serial No. 76,118

8 Claims.

I This invention relates to a power operated hand tool normally employed in drilling and sawing operations.

The object of this invention is to provide in such a hand tool both rotary and reciprocating motion and means for quickly and readily converting from one form of motion to the other.

Another object is to permit such mechanism to be incorporated in a compact housing that may be conveniently held and used in the hands of the' Figure 3 is a top view of the motion controlling parts of the unit shown positioned to provide reciprocating motion.

Figure 4 is a section through 4-4 of Figure 3.

Figure 5 is an enlargement of section 55 of Figure 3.

' Figure 6 is similar to Figure 3 showing the motion controlling parts positioned to provide rotary motion.

Referring to the drawings in which the same or similar numbers refer to the same or similar parts, the tool is housed in body l which follows the general outline of a pistol, having hand grip 2 and switch trigger 5 which enhance the pistol like appearance of the body.

Electric conductors 3 are brought into hand grip 2 to connect with switch 4 which may be closed by squeezing switch triggeri. To hold the switch trigger in switch closed position, trigger lock 6 projecting through the butt of hand grip 2 is available and upon being pressed inward holds switch trigger 5 in locked engagement.

Motor 1 is centrally housed and is journalled in bearings I0. Brush holders 8 are positioned to be accessible from the exterior of body I to permit ease in replacing worn out brushes. Upon rotor shaft 9 is mounted fan II to air cool motor I. Louvres l3 and slots I2 in body I provide air intake and exhaust openings.

The rotary motion produced by rotor shaft 9 is communicated through intermediate cluster gear Hi to gear 2|" which is integral with gear sleeve 2| which in turn encircles and is secured to rotating sleeve 20 by pins 22.

Through rotating sleeve 29 passes shaft I5 which bears drill chuck I6 at its outer end. Rotating sleeve 20 is journalled in bearings Ill and at all times when switch 4 is closed revolves under the action of motor I. A circumferential cam slot is cut into the interior surface of rotating sleeve 20 and in rolling contact in such cam slot is cam roller I8 mounted on roller stud H which projects radially outward from shaft I5 as best shown in Figure 4. Rotating sleeve 20 at one end terminates in clutch teeth 23 adapted to engage with opposite cooperating teeth 23 on linking sleeve 25.

Linking sleeve 25 is splined to shaft I5 as best shown in Figure 5, with splines 24, and is axially movable thereon. As best shown in Figures 3 and 6, at one end it has teeth 23 and at the other end teeth 26. Teeth 26 are engageable with stationary brake 21 which is immovably secured to body I'. In the side of linking s1eeve'25, as shown best in Figure 5, slot 28 accommodates the operating end of clutch lever 29. Clutch lever 29 is mounted in the side of body I on eccentric 30 so that when clutch lever 29 is moved through by means of clutch lever knob 31, linking sleeve 25-will be moved out of engagement with stationary brake 21 and into engagement with rotating-sleeve 20. To define the terminal ends of this 180 range of clutch lever 29, detents 33, as shown in Figure 1, are provided in body I and clutch lever knob ball and spring 32 housed in clutch lever knob 3| cooperate to hold clutch lever 29 in either of the twodetents when the clutch lever knob 3| is moved into position over one of them.

The operation of the unit shown and described is as follows. Switch trigger 5 is pressed by the operator and locked in closed position by the operators pressure upon trigger lock 6. The motor having been thus actuated will cause, through rotor shaft 9 and intermediate cluster gear HI and gear 2|, the rotating sleeve Zil: to revolve. Irrespective of the movement to be imparted to shaft I5, this sleeve 29 will at all times revolve as long as the motor 1 turns over. When the linking sleeve 25 is in the position shown in Figure 3, rotating sleeve 20 in revolving will be in rolling engagement with cam roller I8, causing roller stud II, shaft I5 and drill chuck Is to be reciprocated, but notrotated.

When it is desired to have rotary motion imparted to drill chuck l6, clutch lever 29 is thrown forward to the position shown in Figure 6, causing linking sleeve 25 to disengage from stationary brake 21 and to engage with rotating sleeve 20. When so engaged rotating sleeve 20 will cause linking sleeve 25 to rotate and, it being splined on shaft I5, it will cause shaft i to rotate. When shaft l5 rotates with rotating sleeve 20, roller stud i! will remain stationary in cam slot I9 and drill chuck I'B will be rotated but not reciprocated. a

When clutch lever 29 is thrown to its rearward position, linking sleeve 25 is disengaged from rotating sleeve 20 and engaged with stationary brake 21 thus preventing shaft l5 from rotat-' ing but permitting it to reciprocate axially in the direction of splines 24. Roller stud I! when restrained from rotating about the axis of shaft.

I5 will once again be given reciprocating motion-by the action of cam slot 19 upon it. a

It is apparent that many modifications may be made in this invention without departing from the scope thereof and the specific illustrations herein given are not to be construed as limiting such Scope.

What -I claim is:

1.. In a power operated hand tool holder, a drill chuck bearing shaft to which reciprocating motion is imparted by means of a rotating sleeve encircling such shaft and operably connected therewith by a pin projecting radially from such shaft into a circumferential cam slot in the interior surface of such sleeve, said shaft being restrained from rotating by a linking sleeve splined thereto and engaged with a stationary brake; and to which rotary motion is imparted bymeans holding said linking sleeve in disengagement with said stationary brake and in engagement with the said rotating sleeve.

2. Ina power operated hand tool holder, a drill chuck bearing shaft to which reciprocating motion is imparted by means of a rotatingsleeve encircling such shaft and operably connected therewith by a pin in one member slideable in a cam slot in the other member, said shaft being restrained from rotating by a linking sleeve splined thereto and engaged with a stationary brake; and to which rotary motion is imparted by means holding said linking sleeve in disengagement with said stationary brake and in engagement with the said rotating sleeve.

3'. A power operated hand tool holder compris- I 5.- A power operated hand tool holder comprising an electric motor operably connected with a rotatable sleeve having clutch teeth at one end and a circumferential cam slot in its interior ing an electric motor operably connected with a I i 4. A power operated hand tool holder compris ing an electric motor operably connected with a rotatable sleeve having clutch teeth at one end and a circumferential cam slot in its interior surface; a shaft journalled in such sleeve bearsurface; a shaft journalled in such sleeve bearing a drill chuck at one end and provided with splines in the portion adjacent its other end and havin a stud mounted roller projecting into said cam slot; a stationary brake; a linking sleeve with clutch' teeth at each end splined to said. shaft and moveable in an axial direction thereon; and means for selectively moving the linking sleeve into engagement with said rotating sleeve or with said stationary brake;

6'. Apower operated handtool holder comprise ing an electric motor operably connected with a gear ring encircling and secured to a sleeve having clutch teeth at one ,end and a circum ferential cam slot in its interior surface; a shaft journalled in such sleeve bearing a drill chuck at one end and provided with splines in the-por.

tion adjacent its other end and having a stud mounted roller projectin into said cam slot; a stationary brake; a linking sleeve with clutch teeth.- at each end splined to said'shaft and moveable thereon in an axial direction and means for selectively moving the linking sleeve into engagement with said rotating sleeve or with said stationary brake. I y

7.-Means for translatin rotary motion to reciprocating motion and vice versacompris-inga rotating sleeve with an internal circumferential cam slot and with clutch teeth at one end: a shaft journalled in such sleeve with a pin projecting into such cam slot and provided with splines in one portion thereof; and a linking sleeve splined to said shaft and moveable thereon to selective engagement with either a,station. ary brake or with the clutch teeth of said rotating sleeve. j r

8. Means for translating rotary motion to reciprocatory motion and vice versa comprising a rotating sleeve with clutch teeth at one end; a shaft journalled in such sleeve and provided. with splines in one portion thereof; a cam slot and pin slideable therein operably connecting said shaft and said rotating sleeve; and a linking sleeve splined to said shaft and moveable thereon to selective engagement with either ;a

stationary brake 'or the clutch teeth of said ro- REFERENCES CITED- The following references areof record in the file of this patent:

V UNITED STATES PATENTS Number Name Date 302,430 Roque July 22, 1884 462,530 Booth Nov..3, 189.1:

Schmidt May 3, 1949' 

